[Bug]: Add check for self-referencing input in YAML transform

[Polber]

What happened?

The following pipeline will fail

pipeline:
  transforms:
    - type: Create
      name: Source
      config:
        elements:
          - id: 1
      input: Source
    - type: LogForTesting
      input: Source

with following error:

  ...
  File "/Users/jkinard/beam/sdks/python/apache_beam/yaml/yaml_transform.py", line 163, in strip_metadata
    if isinstance(spec, Mapping):
       ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/jkinard/.pyenv/versions/3.11.6/lib/python3.11/typing.py", line 1305, in __instancecheck__
    return self.__subclasscheck__(type(obj))
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/jkinard/.pyenv/versions/3.11.6/lib/python3.11/typing.py", line 1583, in __subclasscheck__
    return issubclass(cls, self.__origin__)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
RecursionError: maximum recursion depth exceeded in __subclasscheck__

Due to self-referencing transform - this should be a more clear error and caught earlier

Issue Priority

Priority: 2 (default / most bugs should be filed as P2)

Issue Components

• [ ] Component: Python SDK
• [ ] Component: Java SDK
• [ ] Component: Go SDK
• [ ] Component: Typescript SDK
• [ ] Component: IO connector
• [X] Component: Beam YAML
• [ ] Component: Beam examples
• [ ] Component: Beam playground
• [ ] Component: Beam katas
• [ ] Component: Website
• [ ] Component: Infrastructure
• [ ] Component: Spark Runner
• [ ] Component: Flink Runner
• [ ] Component: Samza Runner
• [ ] Component: Twister2 Runner
• [ ] Component: Hazelcast Jet Runner
• [ ] Component: Google Cloud Dataflow Runner